* {
  margin: 0;
  padding: 0;
}
body {
  font-size: 12px;
  font-family: sans-serif;
/* 行高代表字体乘以行高来代表字体所占大小 */
  line-height: 1.62;
}
a {
  text-decoration: none;
  color: #37a;
  cursor: pointer;
}
a:visited {
  color: #669;
}
a:hover {
  display: block;
  color: #fff;
  background-color: #37a;
  width: 100%;
}
table {
  border-collapse: collapse;
  border: none;
  padding: 0;
  margin: 0;
}
.billboard {
  margin-bottom: 50px;
  width: 290px;
}
.billboard h2 {
  color: #111;
  padding-bottom: 10px;
  border-bottom: 1px solid #eaeaea;
  font-size: 16px;
  margin-bottom: 12px;
  line-height: 150%;
}
.billboard h2 span {
  font-size: 13px;
  margin-left: 12px;
}
.billboard td {
  padding: 7px 0;
  border: 1px solid #eaeaea;
}
.billboard td:nth-child(2n+1) {
  width: 20px;
  font-size: 9px;
  text-align: center;
}
.billboard td:nth-child(2n) {
  width: 290px;
}
